Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy

Barrette, J.; Bellwied, R.; Braun‐Munzinger, P.; Cleland, W.; Cormier, T. M.; David, G.; Dee, J.; Diebold, G. E.; Dietzsch, O.; Germani, J. V.; Gilbert, S.; Greene, S. V.; Hall, J. R.; Hemmick, T. K.; Herrmann, N.; Hong, B.; Jayananda, K.; Kraus, D.; Kumar, B. S.; Lacasse, R.; Lissauer, D.; Llope, W. J.; Ludlam, T.; McCorkle, S.; Majka, R.; Mark, S. K.; Mitchell, J. T.; Muthuswamy, Moorthy S.; O’Brien, E.; Pruneau, C.; Rao, M. N.; Rotondo, F. S.; daSilva, N. C.; Sonnadara, D. U. J.; Stachel, J.; Takai, H.; Takagui, E. M.; Throwe, T. G.; Wang, G.; Wolfe, D.; Woody, C. L.; Xu, N.; Zhang, Y.; Zhang, Z.; Zou, C.

doi:10.1016/0370-2693(95)00329-j

Cited by 53 publications

(19 citation statements)

References 23 publications

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“…7. As seen from this figure, the relative number of nucleons excited to ∆ 0 at freeze-out in p+ 12 C collisions at 4 2 GeV/c is compatible with those obtained in Refs [22,24,39,43]. In [67] the dependences of the multiplicities of charged particles on Q value in p+ 12 C collisions at 4 2 GeV/c were investigated, where Q = + − − − evap with + and − being the numbers of positively and negatively (singly) charged particles in an event, respectively, and evap  the number of protons with lab < 300 MeV/c classified as the evaporated ones.…”

supporting

confidence: 91%

“…The freeze-out temperatures of ∆(1232), produced in Ni+Ni collisions at 1 -2 A GeV and Au+Au collisions at 1 06 A GeV, were extracted in [32,33] from the radial flow analysis. Further in [22] the pion enhancement at low transverse momentum was used to determine ∆(1232) abundance in central 28 Si+Al, Pb collisions at lab = 14 6 GeV/c per nucleon (T beam ≈ 13 7 A GeV), and the freeze-out temperature of the system was extracted using the measured ∆(1232) abundance. It was concluded [22] that in central 28 Si+Pb collisions at 14 6 A GeV/c a fireball is formed with substantial excitation of ∆ baryons which freezes out at T 0 = 138 +23 −18 MeV.…”

mentioning

confidence: 99%

“…Further in [22] the pion enhancement at low transverse momentum was used to determine ∆(1232) abundance in central 28 Si+Al, Pb collisions at lab = 14 6 GeV/c per nucleon (T beam ≈ 13 7 A GeV), and the freeze-out temperature of the system was extracted using the measured ∆(1232) abundance. It was concluded [22] that in central 28 Si+Pb collisions at 14 6 A GeV/c a fireball is formed with substantial excitation of ∆ baryons which freezes out at T 0 = 138 +23 −18 MeV. All the above mentioned freeze-out temperatures along with the values of T 0 for ∆ ++ (1232) and ∆ 0 (1232)-resonances, produced on oxygen nuclei in Table 8.…”

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confidence: 99%

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Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Olimov¹,

Haseeb

Olimov

et al. 2011

Open Physics

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Abstract:The production of ∆ 0 (1232)-resonances in p+ 12 C collisions at 4.2 GeV/c was analyzed with 4π acceptance. The mass distribution of ∆ 0 (1232) was reconstructed using an angular criterion. The fraction of charged π − -mesons coming from ∆ 0 (1232) decay was estimated and compared to those obtained in earlier works. The momentum, transverse momentum, kinetic energy, and rapidity distributions as well as invariant cross sections of ∆ 0 (1232)-resonances were reconstructed in the laboratory frame. The mean kinematical characteristics of the reconstructed ∆ 0 (1232) were compared to those of participant protons in experiment and within some of the models. The freeze-out temperature of ∆ 0 (1232) estimated in the present analysis was compared with those obtained using different methods for ∆(1232) produced with other sets of colliding nuclei at various incident energies. The relative number of nucleons excited to ∆ 0 (1232) at freeze-out conditions in p+ 12 C collisions was estimated.

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confidence: 91%

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confidence: 99%

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Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Olimov¹,

Haseeb

Olimov

et al. 2011

Open Physics

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“…1 that the exponential fits represent the data very well for all cases except for pions in the low p T # 0.2 GeV region. The discrepancies between data and the fits in this region are most likely due to the resonance decays [11][12][13][14][15]. The slope parameter T, from the Pb 1 Pb collisions at p s 17.2A GeV increases with particle mass and the trend is independent of the sign of the particle under consideration.…”

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confidence: 99%

Collective Expansion in High Energy Heavy Ion Collisions

Bearden¹,

Bøggild²,

Boissevain³

et al. 1997

Phys. Rev. Lett.

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225

115

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Transverse mass spectra of pions, kaons, and protons from the symmetric heavy-ion collisions 200A GeV S 1 S and 158A GeV Pb 1 Pb, measured in the NA44 focusing spectrometer at CERN, are presented. The mass dependence of the slope parameters provides evidence of collective transverse flow from expansion of the system in heavy-ion induced central collisions. The purpose of studying ultrarelativistic heavy-ion collisions is to understand the nature of hadronic matter under extreme conditions. Specifically, we are interested in a new form of matter, quark-gluon plasma, which may be produced in such collisions. Transverse momentum distributions are one of the most common tools used in studying high energy collisions. This is because the transverse motion is generated during the collision and hence is sensitive to the dynamics. More than 45 years ago, Fermi proposed a statistical method [1] to understand the results of high energy hadron-hadron collisions. Because of saturation of the phase space, the multiparticle production resulting from the high energy elementary collisions is consistent with a thermal description [1][2][3]. In heavy-ion collisions hydrodynamical behavior, that is, local thermal equilibrium and collective motion, may be expected because of the large number of secondary scatterings.It is now possible to identify and quantitatively measure the collective motion by systematic studies of results from different collision systems, using light (Si at BNL and S at CERN) and heavy (Au at BNL and Pb at CERN) ion beams [4][5][6]. A high degree of nuclear stopping and a strong Coulomb effect (also due to the high stopping) have already been reported in Pb 1 Pb central collisions [7,8]. In this Letter, we present transverse momentum distributions of pions, kaons, and protons, measured in the NA44 spectrometer, from Pb 1 Pb and S 1 S collisions. Results of calculations from a hydrodynamical model [5] will be used to aid in this analysis.The NA44 magnetic focusing spectrometer consists of two room-temperature dipoles and three superconducting quadruples. Particles originating from the target are focused at a plane about ten meters downstream and detected by a tracking system consisting of a pad chamberstrip chamber-scintillator hodoscope complex. Particle identification is done with two threshold Cherenkov counters and two highly segmented TOF hodoscopes. The phase-space coverage (transverse momentum p T vs rapidity y) is determined by the combination of the spectrometer angle (relative to the beam direction) and the nominal momentum setting of the magnets. The momentum resolution is typically s p ͞p # 0.2% and the TOF counters have an average time resolution of 100 ps. More details of the spectrometer can be found elsewhere [9].The spectrometer momentum range is 620% around the nominal values of 4 and 8 GeV͞c. For kaons and protons, the 8 GeV͞c setting was used and the rapidity coverage is (2.5-3.4) and (2.4-2.8) for kaons and protons, respectively. Two angular settings (44 and 130 mrad) were utilized in order ...

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“…[1][2][3][4][5][6][7][8][9] that a significant fraction of the pions produced in relativistic hadronnucleus and nucleus-nucleus collisions in bubble chamber experiments of the Joint Institute for Nuclear Research (JINR, Dubna, Russia) originated from decay of resonances. The dominant role of resonances in pion production at the energies of the order of a few GeV/nucleon or less was also revealed in earlier papers [10][11][12][13][14]. The decay kinematics of resonances was shown to be responsible for low transverse momentum enhancement of pion spectra in hadron-nucleus and nucleus-nucleus collisions at incident beam energies from 1 to 15 GeV per nucleon [9,13,14].…”

Section: Introductionmentioning

confidence: 60%

Analysis of rapidity spectra of negative pions ind + 12C,12C +
Olimov
¹
,
Iqbal
²
,
Glagolev
³

et al. 2013
Phys. Rev. C
13
0
0
0
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The experimental rapidity distributions of negative pions were studied in minimum bias d + 12 C, 12 C + 12 C, and 12 C + 181 Ta collisions at 4.2 GeV/c per nucleon with 4π acceptance. The quantitative analysis of centrality dependence of the rapidity as well as transverse momentum versus rapidity spectra of the negative pions in the above collisions was performed by fitting the pion spectra with a Gaussian function. The widths of the rapidity spectra of π − mesons decreased in going from peripheral to central d + 12 C, 12 C + 12 C, and 12 C + 181 Ta collisions. With an increase in collision centrality, the centers of the rapidity distributions of the negative pions shifted towards the target fragmentation region in the case of asymmetric d + 12 C and 12 C + 181 Ta collisions and remained at the midrapidity position for symmetric 12 C + 12 C collisions. The extracted widths and locations of the centers of transverse momentum versus rapidity spectra of the negative pions did not depend within uncertainties on the masses of the projectile and target nuclei as well as the collision centrality. The experimental results were compared systematically with the corresponding results extracted by using a version of the quark-gluon-string model adapted to intermediate energies.

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Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy

Abstract: We present measurements of the pion transverse momentum (p t ) spectra in central Si-nucleus collisions in the rapidity range 2.0 < y < 5.0 for p t down 1

Cited by 53 publications

References 23 publications

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Collective Expansion in High Energy Heavy Ion Collisions

Analysis of rapidity spectra of negative pions ind + 12C,12C +
Olimov
¹
,
Iqbal
²
,
Glagolev
³

et al. 2013
Phys. Rev. C
13
0
0
0
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Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy

Abstract: We present measurements of the pion transverse momentum (p t ) spectra in central Si-nucleus collisions in the rapidity range 2.0 < y < 5.0 for p t down 1

Cited by 53 publications

References 23 publications

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Collective Expansion in High Energy Heavy Ion Collisions

Analysis of rapidity spectra of negative pions ind + 12C,12C + Olimov1, Iqbal2, Glagolev3 et al. 2013Phys. Rev. C13000View full textAdd to dashboardCite

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Analysis of rapidity spectra of negative pions ind + 12C,12C +
Olimov
¹
,
Iqbal
²
,
Glagolev
³

et al. 2013
Phys. Rev. C
13
0
0
0
View full text Add to dashboard Cite